/Engine/Source/Runtime/Engine/Classes/EdGraph/EdGraphSchema.h
Begins a drag and drop action to drag a graph action into another graph
virtual [FReply](API\Runtime\SlateCore\Input\FReply) BeginGraphDragAction ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FEdGraphSchemaAction](API\Runtime\Engine\EdGraph\FEdGraphSchemaAction) > InAction, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & MouseEvent ) const